Reciprocatory electromagnetic pump



Feb. 16, 1954 c. PARKER RECIPROCATORY ELECTROMAGNETIC PUMP Filed Nov 28, 1951 NTOR. ozzzmd zp/w BY v. x

'A DRNEY WITNESS:

Patented Feb. 16, 1954 Leland 0. Parker, Elmira, N. Y., assignor tov Bend'ix.AViationCorporation, acorporation of Dela-- Application November 28, 1951,SeriaI No. 2585573 3 Claims. (01. 103-53).

The present-invention relates to: a reciprocatory electro-magnetic pump, and more particularly to a. single-stage plunger type of. pump arranged to deliver-a liquid against higher pressure than usual for this type of pump.

In the co-pending application of Aumick et al., Serial 243,332 filed August 23, 1951, now Patent No. 2,641,188, and assigned. to the assignee of the present application, a sub-caliber type of pump is disclosed incorporating a magnetic plunger and a piston of reduced diameter actuated thereby, co-operating with a stationary cylinder to form a high pressure pump. The present disclosure is in the nature of an improvement over the structure shown in the earlier application.

It is an object of the present invention to provide a novel high pressure type electro-magnetic pump which is simple in construction, effective in operation, and economical to manufacture.

It is another object to provide such a device which involves only slight alteration of commercial structure to adapt it for high pressure service.

Further objects and advantages will be apparent from the following description taken in connection with the accompanying drawing in which the figure is a vertical substantially midsectional view of a preferred embodiment of the invention.

In the drawing there is illustrated a cylinder I of non-magnetic material which is supported at one end in a cylindrical casing 2 by means of a partition member 3. The lower end of the cylinder is similarly supported in the casing 2 by means of a pole piece 4. A second pole piece 5 is located in the casing at an intermediate point, and an electro-magnet 6 is located between the pole pieces 4 and 5 and adapted to be energized by a battery I under the control of a manual switch 8.

A plunger 9 of magnetic material is slideably mounted in the cylinder I and is yieldably urged toward its upper position as illustrated by means of a spring II bearing against the lower end of the plunger and seated in a cup member I2 attached as indicated at I3 to the pole piece 4. Energization of the electro-magnet 6 draws the plunger 9 downward against the pressure of the spring II. Means indicated generally by numeral I4 is provided for automatically controlling the energization of the electromagnet to cause reciprocation of the plunger. This controlling mechanism is the same as that illustrated and described in the patent to Dickey and Trout 2,472,067, issued June '7, 1949, so that further description thereof is deemed unnecessary.

The plunger 9 is provided with a centrally located. cylindrical bore t5: controlled by' a check. valve I6: mounted in the lower end of the-plunger, and. second check valve H is mounted in. the. lower endof. the cup I2. The plunger is also pro.- vided with one or more channels 23 extending from end to end thereof so as to provide free communication between the spaces 29 and 3| in the cylinder I above and below the plunger respectively.

A hollow piston member I8 is mounted in the upper end of the cylinder I and has a cylindrical portion I9 which fits closely in the bore I5 of the plunger 9 with freedom for relative sliding movement. The fit of the piston I8 in the cylinder I is sufiiciently loose to permit the piston to align itself with the bore of the plunger 9, suitable packing or sealing means 26 being provided to prevent leakage past the piston. The cylinder I is preferably provided with an annular groove 20 receiving the ring 20 and thus serving to anchor the piston IS in the upper end of the cylinder. The piston is provided with a check valve 2 I which prevents downward flow of liquid through its bore 22.

Casing 2 is provided with a cap 23 on its lower end which forms a closed inlet chamber 24, and also has an air dome member 25 which clamps a flexible diaphragm 26 to the top of the casing so as to provide an outlet chamber 21.

In operation, energization of the electromagnet 6 draws the plunger 9 downward, cocking the spring II while the piston I8 remains stationary due to its anchorage 20, 20 in the upper end of the cylinder I. The liquid in the space 3| below the plunger is prevented from escaping back into the inlet chamber 24 by the check valve I! so that the portion thereof represented by the volume of the piston member I8 withdrawn from the bore I5 of the plunger, flows past the check valve I6 into said bore, while the remainder flows through the channels 28 into the space 29 above the plunger. When the coil 6 is de-energized, the spring It becomes effective to move the plunger upward, whereupon the liquid in the bore I5 of the plunger trapped by the check valve [6 is forced out through the upper check valve 2i into the outlet chamber 21. Simultaneously the liquid in the space 29 above the plunger is free to return through the channels 28 to the space 3I below the plunger. Since the cross-sectional area of the cylindrical portion IQ of the piston I8 is much smaller than the cross-sectional area of the plunger 9, it will be appreciated that the force of the spring II which is thus applied against the small area of the piston, is effective to develop ble and changes may be made in the design and 10 arrangement of the parts without departing from the spirit of the invention.

I claim:

1. In a reciprocatory electromagnetic pump, a casing having an inlet chamber in one end and an outlet chamber in the other, a non-magnetic cylinder connecting said chambers, a hollow magnetic plunger slidably mounted therein, means including an electromagnet for reciprocating the plunger, a hollow piston anchored and sealed in the end of the cylinder adjacent the output chamber, extending into the discharge end of the hollow bore of the plunger and closely fitting therein with freedom for relative sliding movement, a

check valve preventing backward flow from the cylinder and check valves preventing backward flow through the bores of the plunger and the piston.

2. A pump as set forth in claim 1 in which said plunger is traversed by a passage which is separate and distinct from its hollow bore, connecting the space above the plunger in the non-magnetic cylinder with the space in said cylinder below the plunger.

3. A pump as set forth in claim 1 including fur ther means for mounting the hollow piston in the discharge end of the cylinder with freedom for slight universal movement, and packing means preventing the passage of liquid through said mounting means.

LELAND C. PARKER.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,822,242 Schongut -l Sept. 8, 1931 2,443,344 Eckleberry June 15, 1948 

